8899779987 has 216 divisors, whose sum is σ = 17231984640. Its totient is φ = 4563306720.

The previous prime is 8899779953. The next prime is 8899779991. The reversal of 8899779987 is 7899779988.

It is not a de Polignac number, because 8899779987 - 2¹⁴ = 8899763603 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (81).

It is not an unprimeable number, because it can be changed into a prime (8899779907) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 215 ways as a sum of consecutive naturals, for example, 189356998 + ... + 189357044.

Almost surely, 2^8899779987 is an apocalyptic number.

8899779987 is a deficient number, since it is larger than the sum of its proper divisors (8332204653).

8899779987 is an equidigital number, since it uses as much as digits as its factorization.

8899779987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 135 (or 107 counting only the distinct ones).

The product of its digits is 1152216576, while the sum is 81.

The square root of 8899779987 is about 94338.6452467916. The cubic root of 8899779987 is about 2072.3340213574.

Subtracting from 8899779987 its reverse (7899779988), we obtain a palindrome (999999999).

The spelling of 8899779987 in words is "eight billion, eight hundred ninety-nine million, seven hundred seventy-nine thousand, nine hundred eighty-seven".